<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        .login-box {
            margin: 50px;
        }

        .login-box .title {
            font-weight: bold;
            line-height: 80px;
            text-align: center;
        }

        .login-box .block {
            margin: 30px 0;
        }

        .login-box .block input {
            height: 40px;
            padding-left: 20px;
            border: 1px solid #ccc;
            border-radius: 5px;
            width: 100%;
            outline: none;
            box-sizing: border-box;
        }
    </style>
</head>

<body>
    <div class="login-box">
        <div class="title">登录页</div>
        <div class="block">
            <input type="text" placeholder="输入用户名">
        </div>
        <div class="block">
            <input type="password" placeholder="输入密码">
        </div>
        <div class="block">
            <input type="button" value="登陆">
        </div>
    </div>

</body>

</html>
<script src="ajax.js"></script>
<script>
    var inputs = document.querySelectorAll('.login-box>.block>input')
    inputs[2].onclick = function () {
        if (inputs[0].value && inputs[1].value) {
            if (/^1[3-9]\d{9}$/.test(inputs[0].value)&& /^\d{4}$/.test(inputs[1].value)) {
                if (/^\d{4}$/.test(inputs[1].value)) {
                    ajax('get', 'data.json', {}, function (data) {
                       var index = data.findIndex((item)=>{
                        return item.username == inputs[0].value && item.password == inputs[1].value
                       })
                       if(index != -1){
                        alert('登录成功')
                       }else{
                        alert('登录失败')
                       }
                    })

                } else {
                    alert('请输入正确手机号/密码')
                }
            }

        } else {
            alert('用户名/密码不能为空！')
        }
    }
</script>